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2. Noise-cancelling headphones - Wikipedia

   en.wikipedia.org/wiki/Noise-cancelling_headphones

   Noise -cancelling headphones alongside a carry case. Noise-cancelling headphones are headphones which suppress unwanted ambient sounds using active noise control. This is distinct from passive headphones which, if they reduce ambient sounds at all, use techniques such as soundproofing . Noise cancellation makes it possible to listen to audio ...

3. Health effects from noise - Wikipedia

   en.wikipedia.org/wiki/Health_effects_from_noise

   Elevated workplace or environmental noise can cause hearing impairment, tinnitus, hypertension, ischemic heart disease, annoyance, and sleep disturbance. [ 3][ 4] Changes in the immune system and birth defects have been also attributed to noise exposure. [ 5] Although age-related health effects ( presbycusis) occur naturally with age, [ 6] in ...

4. 8 white noise machines for better sleep - AOL

   www.aol.com/news/8-white-noise-machines-better...

   Hatch Restore 2. The Hatch Restore 2 is a cross between a sunrise alarm clock and a sound machine that enables you to play consistent white noise. Sunrise alarm clocks gradually emit light to ...

5. White noise machine - Wikipedia

   en.wikipedia.org/wiki/White_noise_machine

   A white noise machine is a device that produces a noise that calms the listener [citation needed], which in many cases sounds like a rushing waterfall or wind blowing through trees, and other serene or nature-like sounds. Often such devices do not produce actual white noise, which has a harsh sound, but pink noise, whose power rolls off at ...

6. Best Noise-Cancelling Headphones: Here’s Where To Get ... - AOL

   www.aol.com/lifestyle/best-noise-cancelling...

   Bose 700 Noise-Cancelling Headphones Traveling can be stressful, especially if you are on a loud flight with a roaring engine on your left side and a crying baby on your right.

7. Active noise control - Wikipedia

   en.wikipedia.org/wiki/Active_noise_control

   Active noise control ( ANC ), also known as noise cancellation ( NC ), or active noise reduction ( ANR ), is a method for reducing unwanted sound by the addition of a second sound specifically designed to cancel the first. The concept was first developed in the late 1930s; later developmental work that began in the 1950s eventually resulted in ...